There were 17 students reading a book. Eight students have finished. How many students are still reading the book?
1 answer:
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Answer:
Step-by-step explanation:
For a standard normal distribution of mean and
the statistic
In this problem we look for the value of X that is 2 standard deviations above the mean.
If there are two standard deviations above the mean, then, in the standard normal distribution, the statistic .
Then, we clear X.
Where:
Answer: 151
Step-by-step explanation:
if prior population proportion is unknown , then the formula is used to find the sample size :
, where = Two tailed critical value for significance level of
E = Margin of error.
Given : margin of error = 8%= .08
For 95% confidence level , two tailed critical value = 1.96
Now, the required sample size :
Hence, the size of the sample needed = 151.